Nondeliquescent product from sulphite waste liquor



Patented Oct. 115, 192

UNITED STATES ,PATENT OFFICE PAUL. ONNERTZ, F BERLIN-WILMERSDORF, ANDHANS WESOHE AND KARL BRODER- SEN, OF DESSAU, GERMANY, ASSIGNORS TO I.G., FARBENINDUSTRIE .AKTIENGE- SELLSCHAFT, OE FRANKFORT-ON-THE-MAIN,GERMANY NONDELIQUESCENT IPRODUCT FROM SULPHITE WASTE LIQUOR No Drawing.Original application filed April 16, 1925, Serial No. 23,692, and inGermany January 24. 1924. Divided and this application filed November12, 1926. Serial No. 148,094.

Sulphite cellulose waste liquor finds many applications for example asan adheslve, for

' lnordanting, tanning, protecting fibers and Washing. For thesepurposes it is generally marketed in the form of concentrated solutionof about -35 Beaum specific gravity and of syrupy consistence. Thereason for this form is that when the liquor is evaporated to drynessthe preparation is strongly deliquescent and very quickly, and,particularly in a damp room, sets to a hard, dark resinous mass, theapplication of which is very (llfliin Water obtained from sulphitecellulose waste liquor free from calciumand ironcompoundsby adding analkali-metal bi chromatean'd then evaporating to dryness.

In testimony whereof we afiix our signacult. The transport of theaqueous liquor is 1 not economical and there are certain disadvantagesconnected with its use on account of its bulk.

The present invention relates to a nondeliquescent solid product easilysoluble in water and having the valuable properties of the concentratedliquor and to a process for preparing'such a product. The invention isbased on the observation that the constituents which impart thedeliquescent properties re-- ferred to can be made ineffectual in thisrespect by treating the liquor with an oxidizing agent, such as analkali metal bichromate.

This application is a division of application Serial Number 23,692,filed Apr. 16, 1925. The following examples, the parts being by weight,illustrate the invention without limitlng it.

Example 1-100 parts of sulphite cellulose waste liquor of 28 Beaum freefrom calciumand iron-compounds are mixed with a' solution of 5 partspotassium bichromate. The mass is evaporated and the dry residue Ipowdered.

Example Q-To 100 parts of sulphite cellulose waste liquor of 36 Beaumwhile stirring a solution of 4 parts of sodium nitrite and theequivalent quantity of hydrochloric acid are added. 'After several hoursthe mass is evaporated to dryness and then powdered.

What we claim is:

1. A non-deliquescent solid product soluble.

in water obtained from sulphite cellulose waste liquor by adding analkali-metal bichromate to the liquor and then drying the solidconstituents of the liquor so treated.

2. I A non-deliquescent solid product soluble

